Zhong Xiaodong, Chen Lian, Wang Baochen, Jin Ge
State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China.
Rev Sci Instrum. 2018 Dec;89(12):123504. doi: 10.1063/1.5049517.
The prompt gamma neutron activation analysis (PGNAA) technology is an online nondestructive material analysis technology widely used in industries. In order to achieve real-time measurements, the gamma ray count rate should reach 400 kcps. Due to the limitation of the detector's decay time, the signal output from the detector is heavily piled up. Meanwhile, the industrial site has a temperature fluctuation of 0-50 °C, causing the peak drift in the energy spectrum. This paper presents a readout electronic system specified for PGNAA and proposes series of algorithms that are dedicated for the gamma-ray spectrometric system. The system can achieve a count rate of 400 kcps, and it overcomes poor resolution, spectral distortion, and peak position shift, which are caused by pulse pileups and temperature fluctuations.
瞬发伽马中子活化分析（PGNAA）技术是一种广泛应用于工业领域的在线无损材料分析技术。为了实现实时测量，伽马射线计数率应达到400千计数每秒。由于探测器衰变时间的限制，探测器输出的信号存在严重的堆积现象。同时，工业现场温度波动范围为0至50摄氏度，导致能谱中的峰值漂移。本文提出了一种专为PGNAA设计的读出电子系统，并针对伽马射线能谱系统提出了一系列算法。该系统能够实现400千计数每秒的计数率，并且克服了由脉冲堆积和温度波动引起的分辨率差、谱失真和峰值位置偏移等问题。
